守护进程
http://www.ruanyifeng.com/blog/2016/03/systemd-tutorial-commands.html
https://www.jianshu.com/p/79059b06a121
systemd
gedit /etc/systemd/system/jenkins.service
开机启动
[Unit] Description=jenkins服务 [Service] Type=simple ExecStart=java -jar /usr/share/jenkins/jenkins.war --httpPort=8081 [Install] WantedBy=multi-user.target
systemctl enable *.service